In his latest newsletter, Joseph Matheny reports that Ong's Hat Compleat, the definitive version of perhaps his best-known work, will be out next year. He also asks for reviews and offers other news, so check it out. (One of the email addresses for sending him reviews had a typo, so see this.)
Please note that a spoken word RAW album Matheny produced, The Lost Studio Session, remains available as a free download at the Internet Archive. I bought it when it came out and enjoyed it.